Yukon River Basin Study National Stream Quality Accounting Network National Research Program Alaska Science Center
NASQAN Yukon River Project Participants OWQ Steve Sorenson Eastern Region Tom Kraemer Mary Voytek Lisa Fogarty NRP Western Region Carol Kendall Bob Michel Dan Doctor District AK Steve Frenzel Tim Brabets Mat Schellekens Dustin Langley Gary Solin Zan Frederick Randy Host Ed Neal GA Art Horowitz Ca Brian Bergamaschi TX Pete Van Metre Barb Mahler WI Dave Krabbenhoft Mark Olson John De. Wild OR Valerie Kelly UMN Jacques Finlay Yale Pete Raymond Central Region George Aiken Kenna Butler Mark Dornblaser Dennis Eberl Doug Halm Bob Meade Mike Reddy Paul Schuster Rob Striegl Howard Taylor Kim Wickland FSU Jeff Chanton USM Alan Shiller Inter-tribal Council: Rob Rosenfeld Contract Observers
Investigators Aiken: DOC characterization; carbon cycling Striegl: CO 2 fluxes; carbon cycling Krabbenhoft: Hg cycling Reddy/Schuster: Hg-DOC interactions, major ions Kendall: POM isotopes Horowitz: Trace metals in sediments Eberl: Sediment mineralogy Shiller: Trace metal cycling Taylor: Major cations, trace metals, nutrients, rare earths Michel: Tritium Kraemer: U isotopes Brabets: River hydrology/sediments Host/Neal (AK): Discharge (ADCP)
Safety Concerns Safety Training Motorboat Operation Certification Class: swift water training In water PFD training Wilderness survival, 1 st aid/CPR Firearms/pepper spray training: bears Inoculations: Hepatitis
Intensive Sampling Campaigns: NRP Process-based studies Tributary/main stem sampling point selection based on: • • Logistics (Can we measure discharge? ) QW data (Kayaker; identify end members) Research interests Basin characteristics • Permafrost coverage • Size • Land use (mining) • Veg classification • Physiography • Source area
BRR-CR Intensive sampling: Progress to date 2002 Eagle to bridge (2 trips) 2100 river miles 22 sampling sites ~1500 WQ samples 2003 Bridge to Pilot (1 st trip) 930 river miles 17 sampling sites ~570 WQ samples
Fixed Station Sampling: AK SC Baseline data Five Stations: Yukon @Eagle (at Canadian border) Porcupine River (major trib) Yukon @ Bridge (this photo) Tanana River (major trib) Yukon @ Pilot Station (“outlet”) Sampling schedule (2001 -2005) One under ice sampling in March Every two weeks after ice out (June to Oct) approx 7 samples from each Station
AK Science Center Fixed Station sampling: Progress to date 5 stations sampled 2001: 7 times 2002: 7 times 2003: 3 times to date Confluence of the Yukon and Tanana Rivers showing the mixing zone
Outreach: Eagle, Alaska, American Creek Grades K 6 -12 Water quality sampling CO 2 sampling
Carbon Cycling George Aiken motoring up a trib to collect DOC and other samples Distinct hydrologic connection to the transport of carbon Consistent SUVAs suggest a common source of carbon
Carbon dioxide and Methane emissions Where and when are the sources and sinks? Rob Striegl collects a sample for CO 2 and methane Preliminary data: Main stem and tribs between Eagle and Bridge 2. 5 x to 10 x > atm CO 2
Terrestrial C Cycling and Permafrost Melting Black spruce forests underlain by permafrost may be converted to wetlands when the permafrost melts. Results from lab incubations of soils collected from a black spruce forest and a collapse bog indicate that potential CO 2 loss through respiration and potential DOC loss decrease after a forest collapses and becomes a wetland. This is probably in part due to vegetation changes. Field and lab studies are currently underway to further investigate the effects of permafrost melting on C cycling. Black Spruce Forest Permafrost Collapse Bogs
Acoustic Doppler Current Profiler (ADCP) Randy Host, AK SC setting up ADCP for a discharge measurement on the Yukon River
Process-based research Do the relations hold as we move up in stream order (scale) from very small to very large? Will climate-change (i. e. melting permafrost) affect the ecology of the Yukon basin across scales?
Characterizing a river system as large as the Yukon and understanding carbon cycling and metals interactions in the Yukon River Drainage Basin will be as challenging as navigating the twisted channels of the Yukon Flats
Скачать презентацию Yukon River Basin Study National Stream Quality Accounting
e125bdd9e69b37ee159866a9d33e7765.ppt